According to the ATF database, there are 6 registered FFLs in Harrison, Maine.
30 CAMP PINECLIFFE ROADHARRISON, ME, 04040
30 CAMP PINECLIFFE ROADHARRISON, ME, 4040
32 PITTS ROADHARRISON, ME, 04040
224 BUCK RDHARRISON, ME, 04040
224 BUCK RDHARRISON, ME, 4040
57 VACATIONLAND RDHARRISON, ME, 04040